Add remaining project files (exclude ignored folders)

tracking/kata_kunci.php

@@ -0,0 +1,42 @@
+<?php
+
+define('SECRET_KEY', 2704960011);
+
+// Enkripsi ID -> format: MP-<salt><middle>-<checksum>
+function encryptNumberID($id) {
+    $salt = rand(100, 999); // 3 digit salt
+    $raw = ($id + $salt) * SECRET_KEY;
+    $middle = substr(str_pad($raw, 12, '0', STR_PAD_LEFT), 0, 7); // bagian dienkripsi
+    $checksum = substr(strval(($id * 97 + $salt) % 100000), -5); // 5 digit checksum
+
+    return "MP-$salt$middle-$checksum";
+}
+
+// Dekripsi berdasarkan salt yang sudah ditanam
+function decryptNumberID($encrypted) {
+    if (!preg_match('/^MP-(\d{10})-(\d{5})$/', $encrypted, $matches)) {
+        return null;
+    }
+
+    $salt = intval(substr($matches[1], 0, 3));  // 3 digit salt di awal
+    $middle = substr($matches[1], 3);           // 7 digit encode
+    $checksum = $matches[2];
+
+    $maxTries = 100000; // Maksimal 100.000 iterasi, tidak sampai 9 juta
+
+    for ($id = 1; $id <= $maxTries; $id++) {
+        $raw = ($id + $salt) * SECRET_KEY;
+        $encoded = substr(str_pad($raw, 12, '0', STR_PAD_LEFT), 0, 7);
+        if ($encoded !== $middle) {
+            continue; // langsung skip jika encode beda
+        }
+
+        // Jika middle cocok, baru cek checksum
+        $check = substr(strval(($id * 97 + $salt) % 100000), -5);
+        if ($check === $checksum) {
+            return $id; // ketemu
+        }
+    }
+
+    return null; // tidak ditemukan
+}